WO2013094000A1 - 電池における溶接構造、その形成方法、二次電池セルおよび二次電池モジュール - Google Patents
電池における溶接構造、その形成方法、二次電池セルおよび二次電池モジュール Download PDFInfo
- Publication number
- WO2013094000A1 WO2013094000A1 PCT/JP2011/079398 JP2011079398W WO2013094000A1 WO 2013094000 A1 WO2013094000 A1 WO 2013094000A1 JP 2011079398 W JP2011079398 W JP 2011079398W WO 2013094000 A1 WO2013094000 A1 WO 2013094000A1
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- WIPO (PCT)
- Prior art keywords
- battery
- lid
- conductive metal
- metal member
- welded structure
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 29
- 238000007747 plating Methods 0.000 claims abstract description 82
- 238000003466 welding Methods 0.000 claims abstract description 76
- 230000002093 peripheral effect Effects 0.000 claims abstract description 51
- 229910052751 metal Inorganic materials 0.000 claims description 160
- 239000002184 metal Substances 0.000 claims description 160
- 238000010828 elution Methods 0.000 claims description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 238000002844 melting Methods 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 20
- 238000010248 power generation Methods 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- 239000010949 copper Substances 0.000 claims description 15
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 8
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 6
- 229910001128 Sn alloy Inorganic materials 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 5
- 239000003792 electrolyte Substances 0.000 claims description 5
- 239000008151 electrolyte solution Substances 0.000 claims description 5
- 230000004927 fusion Effects 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 105
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 18
- 238000004804 winding Methods 0.000 description 14
- 229910052759 nickel Inorganic materials 0.000 description 9
- 150000002739 metals Chemical class 0.000 description 7
- 239000002344 surface layer Substances 0.000 description 7
- -1 polypropylene Polymers 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 238000003776 cleavage reaction Methods 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000007017 scission Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005304 joining Methods 0.000 description 4
- 239000011255 nonaqueous electrolyte Substances 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009993 protective function Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000003660 carbonate based solvent Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 2
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- QHSJIZLJUFMIFP-UHFFFAOYSA-N ethene;1,1,2,2-tetrafluoroethene Chemical group C=C.FC(F)=C(F)F QHSJIZLJUFMIFP-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/155—Lids or covers characterised by the material
- H01M50/157—Inorganic material
- H01M50/159—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/155—Lids or covers characterised by the material
- H01M50/164—Lids or covers characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/30—Preventing polarity reversal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/4911—Electric battery cell making including sealing
Definitions
- the present invention welds conductive metal members forming a current path in a secondary battery module or the like constituted of a secondary battery cell represented by a lithium ion secondary battery etc. and a plurality of secondary battery cells
- the present invention relates to a welded structure in a battery, a method of forming the same, a secondary battery cell, and a secondary battery module.
- a cylindrical secondary battery is formed in a closed structure by housing a power generation element in a bottomed cylindrical battery can and injecting an electrolytic solution, and sealing an opening of the battery can with a battery lid.
- the power generation element has positive and negative electrodes, and for example, the positive electrode is electrically connected to the battery cover.
- a safety valve device integrated with the battery cover by caulking or the like is provided between the positive electrode and the battery cover. The battery cover and the safety valve device are crimped to the periphery of the opening provided on one end side of the battery can via the gasket.
- the battery cover is made of, for example, stainless steel
- the safety valve device is made of, for example, aluminum.
- a method is known in which the tip of the safety valve device is irradiated with a laser to weld the safety valve device to the battery lid (for example, 1).
- the safety valve device is melted by laser irradiation, the flowing aluminum-based metal and the iron-based metal are fused, and they are strongly bonded.
- the welded structure in the battery according to the first aspect of the present invention comprises a first conductive metal member, a metal layer provided on the first conductive metal member, and a material different from the first conductive metal member.
- the metal layer is formed of a material whose bonding strength by welding to the first conductive metal member is larger than that of the second conductive metal member preferable.
- the welded structure in the battery according to the third aspect of the present invention is the welded structure in the battery according to claim 1 or 2, wherein the first conductive metal member is made of iron, copper, iron alloy, or copper alloy.
- the second conductive metal member formed is made of any of aluminum, copper, tin or an aluminum alloy, a copper alloy or a tin alloy.
- the welded structure in the battery according to the fourth aspect of the present invention is the welded structure in the battery according to any one of claims 1 to 3, wherein the metal layer is a plated layer provided on the first conductive metal member. Is preferred.
- a welded structure in a battery according to a fifth aspect of the present invention is the welded structure in a battery according to any one of claims 1 to 4, wherein the battery comprises a power generation unit having positive and negative electrodes, A battery can formed with an opening and containing a power generation unit and an electrolyte therein, a lid case connected to one of the positive and negative electrodes of the power generation unit, and a lid case integrated with a plated layer on the surface A formed battery lid, the first conductive metal member is a battery lid, the metal layer is a plating layer, and the second conductive metal member is a lid case Can.
- the welded structure in the battery according to the sixth aspect of the present invention is the welded structure in the battery according to claim 5, wherein the battery lid and the lid case have a circular shape in plan view, and the melting portion and the eluting portion are lids It can be provided intermittently at multiple places along the periphery of the case.
- the lid case may be provided with a cleavage valve.
- a welded structure in a battery according to an eighth aspect of the present invention is a welded structure in a battery according to claim 6 or 7, wherein the battery lid has a hat-like shape having a peripheral portion and a cylindrical portion rising from the peripheral portion
- the lid case may be disposed on the inner surface side of the peripheral portion of the battery lid, and the tip of the lid case may be welded to the plating layer on the inner surface side of the peripheral portion of the battery lid.
- the welded structure in a battery according to a ninth aspect of the present invention is the welded structure in a battery according to claim 6 or 7, wherein the battery lid has a hat-like shape having a peripheral portion and a cylindrical portion rising from the peripheral portion
- the lid case is disposed on the inner surface side of the peripheral edge of the battery lid, and the peripheral edge of the lid case is crimped from the inner surface to the outer surface of the peripheral edge of the battery lid, and the outer surface side of the peripheral edge of the battery lid
- the tip of the peripheral portion of the lid case may be welded to the plating layer.
- the welded structure in a battery according to a tenth aspect of the present invention is the welded structure in a battery according to the eighth or ninth aspect, wherein the battery lid is provided at a head of the cylindrical portion along the circumferential direction. It is preferable that an opening is provided, and one end and the other end in the circumferential direction of the melting portion and the elution portion of the lid case are provided at positions not corresponding to the opening.
- a welded structure in a battery according to an eleventh aspect of the present invention is the welded structure in a battery according to any one of claims 7 to 10, further comprising a gasket, and the battery lid and lid case are through the gasket. You may make it crimp on the peripheral part of the opening of a battery can.
- a secondary battery cell according to a twelfth aspect of the present invention comprises a welded structure in a battery according to any one of claims 5 to 11.
- a welded structure in a battery according to a thirteenth aspect of the present invention is the welded structure in a battery according to any one of claims 1 to 4, wherein the battery has an opening at one end, and the battery unit and the electrolyte
- a bus bar connecting electrode terminal members of adjacent secondary battery cells to each other, wherein the first conductive metal member is an electrode terminal member, and the metal layer is a plating layer,
- the second conductive metal member can be a bus bar.
- the bus bar in the welded structure of the battery according to claim 13, is formed in a rectangular plate shape having a front end face, a rear end face and a pair of side surfaces The elution portion is preferably provided on the front end surface, the rear end surface, and the pair of side surfaces of the bus bar.
- the bus bar in the welded structure of a battery according to the fifteenth aspect of the present invention, is preferably attached to the battery cover together with the electrode terminal member by a fastening member.
- the secondary battery module according to a sixteenth aspect of the present invention comprises a welded structure in a battery according to any one of claims 13-15.
- a method of forming a welded structure in a battery comprising: forming a welded structure on a surface of a metal layer provided on a first conductive metal member using a material different from the first conductive metal member.
- the metal layer has a bonding strength by welding to the first conductive metal member. It is preferable to be formed of a material larger than that of the second conductive metal member.
- the first conductive metal member is plated with a metal layer. It is preferable to include the step of forming
- the method for forming a welded structure in a battery according to the twentieth aspect of the present invention is the method for forming a welded structure in a battery according to claim 18 or 19, wherein the second step is performed on the tip of the second conductive metal member.
- the laser irradiation step comprises the tip of the second conductive metal member by laser irradiation. It is preferable to provide a melting portion and an elution portion at the same time as annealing the metal layer.
- the irradiation angle of the laser irradiating the second conductive member is It is preferable that the second conductive member is inclined to the outside with respect to the end surface with respect to the surface parallel to the end surface of the conductive member 2 and within 20 degrees from the surface parallel with the end surface.
- the metal layer is welded to the surface of the metal layer. Therefore, it is possible to obtain a highly reliable welded structure having a small electric resistance and a large bonding strength.
- FIG. 2 is an exploded perspective view of the secondary battery cell shown in FIG. 1;
- FIG. 4 is a plan view of the battery lid unit illustrated in FIG. 3;
- A) is the enlarged view of the area
- (b) is the figure which looked at the welding part in (a) from the upper surface.
- FIG. 10 is a cross-sectional view of the secondary battery module shown in FIG. 9 taken along line XX.
- FIG. 12 is an enlarged cross-sectional view of the secondary battery module shown in FIG. 9 along the line XI-XI.
- FIG. 1 is an external perspective view of a lithium ion secondary battery cell as an embodiment of a welded structure in a battery according to the present invention
- FIG. 2 is an exploded perspective view of the secondary battery cell shown in FIG. It is.
- the secondary battery cell (battery) 1 shown in FIG. 1 has a structure and performance suitable for hybrid electric vehicles, and has, for example, a cylindrical shape with an outer diameter of 40 mm ⁇ and a height of 90 mm, and has a rated capacity of 5 Ah. is there.
- the secondary battery cell 1 is a battery container including the battery can 2 and the battery lid unit 30 in which the cylindrical power generation unit 20 shown in FIG. 2 is accommodated and in which a non-aqueous electrolyte (not shown) is injected.
- the battery can 2 is formed in a bottomed headed cylindrical shape having an opening on the upper (one end) side, and made of 0.5 mm thick carbon steel having a nickel plating layer on the inner and outer surfaces.
- the battery lid unit 30 is configured by integrating the battery lid 3 and the lid case 37, closes the opening of the battery can 2 and is caulked by the battery can 2, whereby the battery container sealed from the outside is It is formed.
- a long positive electrode and a negative electrode are wound around a hollow cylindrical shaft core 15 made of polypropylene, with a separator interposed therebetween.
- the positive electrode of the winding group 10 is configured by applying a positive electrode mixture on both surfaces of an aluminum-based metal foil in which positive electrode tabs are arranged at equal intervals along one side edge in the longitudinal direction.
- the negative electrode is formed by coating a negative electrode mixture on both surfaces of a copper-based metal foil in which negative electrode tabs are arranged at equal intervals along one side edge in the longitudinal direction.
- the positive electrode and the negative electrode are wound in a state in which the positive electrode tab and the negative electrode tab are disposed on opposite sides.
- a positive electrode current collecting member 31 for collecting a positive electrode potential is disposed on the upper side of the winding group 10.
- the positive electrode current collection member 31 is formed of an aluminum-based metal, and is connected to the positive electrode through a positive electrode tab. Joining of the positive electrode tab to the positive electrode current collecting member 31 is performed, for example, by ultrasonic welding.
- a flexible positive electrode conductive lead 33 configured by laminating a plurality of aluminum-based metal foils is provided.
- One end of the positive electrode conductive lead 33 is joined to the positive electrode current collector 31 by resistance welding, ultrasonic welding or the like.
- the other end of the positive electrode conductive lead 33 is joined to the positive electrode connection plate 35 by laser welding or the like.
- the positive electrode connection plate 35 is formed of an aluminum-based metal, and the outer periphery thereof is held by an insulating ring 38 made of polypropylene.
- a negative electrode current collecting member 21 for collecting a negative electrode potential is disposed below the winding group 10.
- the negative electrode current collecting member 21 is formed of a copper-based metal, and is connected to the negative electrode through a negative electrode tab. Joining of the negative electrode tab to the negative electrode current collecting member 21 is performed, for example, by ultrasonic welding.
- a negative electrode conductive lead 23 made of nickel is provided below the negative electrode.
- the negative electrode conductive lead 23 has a shape in which the central portion is bent and protrudes from both ends to the can bottom side of the battery can 2, and both ends are, for example, the negative electrode current collector 21 by ultrasonic welding or spot welding. Is bonded to the bottom of the
- the winding group 10 the positive electrode current collecting member 31, the positive electrode conductive lead 33, the positive electrode connection plate 35, the insulating ring 38, the negative electrode current collecting member 21 and the negative electrode conductive lead 23 are integrally coupled. There is.
- the power generation unit 20 is accommodated in the battery can 2 and is joined to the battery can 2 by resistance welding or the like in a state where the central portion of the negative electrode conductive lead 23 is pressed against the can bottom of the battery can 2.
- the electrode rod is inserted into the hollow portion of the shaft core 15 and the negative electrode conductive lead 23 is attached to the battery can 2 by the tip of the electrode rod. Press the bottom of the can.
- the battery can 2 connected to the negative electrode of the winding group 10 through the negative electrode conductive lead 23 and the negative electrode current collecting member 21 is used as an output end of the negative electrode.
- a solution in which a lithium salt is dissolved in a carbonate-based solvent can be used.
- lithium salts include lithium hexafluorophosphate (LiPF6), lithium fluoroborate (LiBF4), and the like.
- the carbonate-based solvent ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), propylene carbonate (PC), methyl ethyl carbonate (MEC), or a solvent selected from the above solvents And mixtures thereof.
- a non-aqueous electrolytic solution in which 1 mol / liter of lithium hexafluorophosphate is dissolved as an electrolyte in a mixed solvent of EC, DMC and DEC is used.
- the winding group 10 is infiltrated with the non-aqueous electrolyte.
- FIG. 3 is an enlarged cross-sectional view of battery lid unit 30 shown in FIG. 2, and FIG. 4 is a plan view from above of battery lid unit 30 shown in FIG.
- the battery lid unit 30 is configured such that the battery lid (first conductive metal member) 3 and the lid case (second conductive metal member) 37 are integrated by caulking and conduct each other. .
- the positive electrode connection plate 35 is joined to the lid case 37 at the center thereof by, for example, resistance welding or friction diffusion bonding.
- the battery lid 3 electrically connected to the lid case 37 is connected to the positive electrode of the winding group 10 through the positive electrode connection plate 35, the positive electrode conductive lead 33, and the positive current collecting member 31. It is used as the other output end.
- the electric power stored in the winding group 10 can be taken out by the negative electrode output terminal on the bottom surface of the battery can 2 and the positive electrode output terminal on the upper surface of the battery 3 described above.
- the battery cover 3 is formed of an iron-based metal such as carbon steel, and a nickel plating layer (metal layer) 4 (see FIG. 5) is provided on the entire surface.
- Iron-based metals include iron and iron alloys.
- the thickness of the plating layer 4 is, for example, 0.01 mm or less.
- the battery lid 3 is formed in a shape having a circular peripheral portion 3a in a plan view, and a cylindrical portion having a rising portion 3b and a head portion 3c formed at the upper end of the rising portion 3b rising from the peripheral portion 3a. .
- An exhaust port 3d1 is formed at the center of the head 3c of the cylindrical portion. Further, around the cylindrical portion, a plurality of exhaust ports 3d2 extending from the peripheral portion of the head 3c to the rising portion 3b are formed.
- the lid case 37 is formed of an aluminum-based metal and has a circular shape in plan view.
- Aluminum-based metals include aluminum and aluminum alloys.
- the lid case 37 is disposed on the inner surface side of the battery lid 3, in other words, on the battery can 2 side, and the peripheral portion 37b is bent from the inner surface side of the peripheral portion 3a of the battery lid 3 to the outer peripheral side 3a1 to the outer surface side It is folded back and crimped to the battery lid 3.
- the central region 37a of the lid case 37 is curved toward the battery can 2 side more than the peripheral portion 37b.
- a cleavage valve 37c (see FIG. 2) formed in a groove shape having a V-shaped cross section is formed on the surface of the battery lid 3 on the cylindrical portion side.
- the cleavage valve 37c has a function as a safety mechanism that cleaves and releases gas in order to secure safety against an increase in the internal pressure of the battery when the electrolyte is decomposed and gas is generated due to overcharge or the like.
- the exhaust ports 3d1 and 3d2 formed in the battery lid 3 are formed to discharge the mist-like gas released from the inside of the secondary battery cell 1 when the cleavage valve 37c is cleaved.
- FIG.5 (a) is an enlarged view of the area
- FIG.5 (b) is the figure which looked at the welding part 40 in Fig.5 (a) from the upper surface.
- the lid case 37 crimped to the battery lid 3 is welded to the plating layer 4 at the welding portion 40 at the tip of the peripheral portion 37 b folded back to the outer surface side of the battery lid 3.
- the plating layer 4 is formed of nickel, which has a bonding strength by welding to an iron-based metal larger than that of an aluminum-based metal.
- the dotted line shows the shape of the end of the peripheral portion 37b of the lid case 37 before the lid case 37 is welded to the plating layer 4.
- the welding portion 40 includes a melting portion 41 formed on the peripheral edge portion of the front end 37 d before welding, and an elution portion 42 which flows outward from the front end 37 d before welding.
- the melting portion 41, the elution portion 42, and the front end 37d before welding are formed in an arc shape as illustrated in FIG. 5 (b).
- the melting portion 41 is generally thinner than the thickness of the lid case 37 before welding, and has a shape that gradually inclines toward the tip 37 d side before welding.
- the elution portion 42 is formed gently and continuously on the melting portion 41 at the tip 37 d before welding, and has a shape which is gradually inclined to become thinner toward the tip after welding as well. .
- the aluminum-based metal as the base material of the lid case 37 diffuses to the surface layer of the plating layer 4 and is metal-joined.
- the depth at which the fusion zone 41 and elution zone 42 are joined to the plating layer 4 is only the surface layer of the plating layer 4 and does not extend over the entire plating layer 4 and does not reach the surface of the battery lid 3 .
- the plated layer 4 is annealed at the periphery of the welding portion 40 as described later.
- Battery cover 3 which is an iron-based metal member and aluminum-based metal member are welded by welding the entire of fused part 41 and elution part 42 to plating layer 4 on the surface of plating layer 4 formed on battery cover 3
- the lid case 37 is integrated by a highly reliable welded structure having a small electric resistance and a large bonding strength. Since the melting portion 41 and the elution portion 42 are metal-bonded in the surface layer of the plating layer 4, the protective function of the battery lid 3 by the plating layer 4 such as corrosion resistance of the battery lid 3 is maintained. In addition, since the elution portion 42 has a large distance flowing on the plating layer 4 and a bonding area increases, the bonding strength can be further increased. Furthermore, the adhesion between the battery cover 3 and the plating layer 4 is improved by annealing the plating layer 4.
- two welds 40 are formed in a circular arc along the periphery of the lid case 37.
- Each welding portion 40 is continuously formed from one end to the other end such that one end corresponds to the position of one exhaust port 3d2 and the other end corresponds to the position of the adjacent exhaust port 3d2.
- Each welding portion 40 is formed in a positional relationship such that the entire adjacent pair of exhaust ports 3d2 is included in the region.
- the two welds 40 are formed as a pair in line symmetry with respect to the center of the lid case 37.
- the method of forming the said welding structure is demonstrated.
- the laser is irradiated in the vicinity of the corner 37e of the tip 37d of the lid case 37 before welding.
- the irradiation position of the laser is desirably, for example, about 0.1 mm inside of the tip 37d. Assuming that the irradiation position of the laser is 0.1 mm from the tip 37d and the tolerance of the distance from the tip 37d is ⁇ 0.1 mm, the center of the laser spot will not be outside the corner 37e of the lid case 37.
- the laser irradiation is performed by irradiating the laser to the tip portion of the lid case 37 and the plating layer 4 so that the welding portion 40 of the lid case 37 and the plating layer 4 are welded on the surface of the plating layer 4 Do. If the output of the laser is too large, the plating layer 4 melts throughout the layer thickness, and the protective function such as corrosion resistance by the plating layer 4 on the battery lid 3 is lost. In the case of such excessive irradiation, the plating layer 4 is discolored and appears dark in visual observation.
- the temperature of the plating layer 4 is increased, and an annealing process is performed to reduce disturbance and stress in the crystal. Therefore, the adhesion between the battery cover 3 and the plating layer 4 is improved.
- the spot diameter of the laser is 0.75 mm.
- the irradiation angle ⁇ of the laser is inclined toward the outside of the front end 37d with respect to the plane parallel to the surface of the front end 37d of the lid case 37, and preferably within 20 degrees from the plane of the front end 37d. It is more preferable to When the inclination angle ⁇ of the laser irradiation is larger than 20 degrees, the loss of energy due to the reflection from the battery lid 3 becomes large, and it becomes difficult to cause the molten portion 41 to flow to the tip side.
- FIG. 6 is a plan view of a battery lid unit as a second embodiment of a welded structure in a battery according to the present invention.
- the difference between the battery cover unit 30 of the second embodiment and the first embodiment shown in FIG. 4 is the positional relationship between the exhaust port 3d2 and the welded portion 40.
- the welding portions 40 are formed in a circular arc at two locations along the periphery of the lid case 37 and in a pair in line symmetry with respect to the center of the lid case 37.
- each welding portion 40 corresponds to the position of one exhaust port 3d2 at one end, and corresponds to the position of the adjacent exhaust port 3d2 at the other end. , And are formed in such a positional relationship as to be included in the region.
- each welded portion 40 has one end and the other end positioned at positions corresponding to the middle of the exhaust port 3 d 2, and one exhaust port 3 d 2 corresponds to each welded portion 40. It is arranged corresponding to the central part of. Therefore, the area of the welded portion 40 in the region not corresponding to the exhaust port 3d2 is increased, the current path as a whole is shortened, and the electrical resistance of the battery lid 3 and the lid case 37 can be further reduced.
- the exhaust ports 3d2 are illustrated as a structure in which four exhaust ports 3d2 are formed at intervals of 90 degrees, but the number and positions of the exhaust ports 3d2 can be changed as appropriate.
- the length and the number of welds 40 are merely an example, and the length and the number of welds 40 can be set as appropriate.
- the welding portion 40 may be provided along the entire periphery of the peripheral portion 37b of the lid case 37, or a plurality of welding portions may be provided in a spot shape.
- FIG. 7 is a cross-sectional view of a battery lid unit as a third embodiment of the welded structure in the battery according to the present invention
- FIG. 8 is an enlarged view of the main part of the battery lid unit shown in FIG. FIG.
- the difference between the battery lid unit 30 of the fifth embodiment and the first embodiment shown in FIG. 3 is that the lid case 37A and the battery lid 3 are not crimped.
- the lid case 37A is formed to have a diameter smaller than the diameter of the battery lid 3 in a plan view, and the welding portion 40 of the peripheral portion 37b has a tip end that corresponds to that of the battery can 2 of the peripheral portion 3a of the battery lid 3. It is located inside.
- the lid case 37A is welded to the plating layer 4 in which the welding portion 40 is formed on the battery lid 3 on the inner surface side of the peripheral portion 3a of the battery lid 3.
- the welding portion 40 has the melting portion 41 and the elution portion 42 and is welded to the plating layer 4 on the surface.
- the battery lid 3 and the lid case 37 integrated in the welding portion 40 are crimped to the periphery of the opening provided at the upper end of the battery can 2 with the gasket 39 interposed.
- the gasket 39 covers the welding portion 40 provided at the peripheral portion of the lid case 37, the inner surface of the peripheral portion 3a of the battery lid 3, the outer peripheral side 3a1, and the outer surface of the peripheral portion 3a. It is compressed by the case 37.
- the other configuration is the same as that of the first embodiment, and the corresponding components are denoted by the same reference numerals and the description thereof will be omitted.
- FIGS. 9-11 show Embodiment 4 of the welding structure in the battery based on this invention.
- FIG. 9 is an external perspective view of a secondary battery module.
- the secondary battery module (battery) 100 is formed by assembling a plurality of square secondary battery cells 110, and has, for example, a structure suitable for a hybrid vehicle.
- Each of the secondary battery cells 110 is, for example, a lithium ion secondary battery, and alternately arranged in the opposite direction so that the external positive electrode terminal 61 and the external negative electrode terminal 71 face the adjacent secondary battery cells 110. It is arranged.
- the battery is used as a term in a broad sense including the secondary battery cell 1 and the secondary battery module 100.
- the external positive electrode terminal 61 and the external negative electrode terminal 71 of the adjacent secondary battery cells 110 are electrically connected by the bus bars 150, and the entire secondary battery cells 110 are connected in series.
- the bus bar 150 is inserted into the external positive electrode terminal 61 and the external negative electrode terminal 71, is fastened by a nut 57, and is attached to the battery cover (first conductive metal member) 103.
- the external positive terminal 61 of the secondary battery cell 110 disposed on one end side and the external negative terminal 71 of the secondary battery cell 110 disposed on the other end are connected to an external device by a connection member (not shown).
- a discharge current is supplied from the secondary battery module 100 to the external device.
- a cleavage valve 103 a is formed between the external positive electrode terminal 61 and the external negative electrode terminal 71 in the upper part of each secondary battery cell 110.
- FIG. 10 is a cross-sectional view of the secondary battery module shown in FIG.
- the secondary battery cell 110 is provided on a winding group 210 which is a power generation body, a battery can 104 accommodating the winding group 210, a battery lid 103 for sealing the open end of the battery can 104, and a battery lid 103.
- the positive electrode terminal structure and the positive electrode current collector plate 121 electrically connecting the positive electrode terminal structure and the positive electrode of the winding group 210 are provided.
- secondary battery cell 110 is not shown in FIG. 10, and is a negative electrode current collector for electrically connecting the negative electrode terminal structure provided on battery cover 103, the negative electrode terminal structure, and the negative electrode of winding group 210. I also have a body.
- the positive electrode connection terminal 62 of the positive electrode terminal structure integrated with the battery lid 103 is crimped and fixed to the positive electrode current collector 121 to produce a lid assembly, and the lid assembly is positive
- the power generation unit assembly is manufactured by welding to the winding group 210 via the current collector 121.
- the power generation unit assembly is housed in the battery can 104, and the battery lid 103 is laser welded to the open end of the battery can 104 to seal the inside of the battery can, and non-aqueous electrolysis is performed from the liquid inlet of the battery lid 103 to the inside of the battery can.
- the secondary battery cell 110 is manufactured by filling the liquid and sealing the liquid inlet with a lid.
- the peripheral portion 103 b of the battery cover 103 is thin, and the peripheral portion 103 b is joined to the battery can 104 by, for example, laser welding in a state fitted to the peripheral portion of the upper opening of the battery can 104.
- a battery container with a sealed structure is formed.
- the battery cover 103 is formed of an iron-based metal or the like.
- On the positive electrode side there is a positive electrode terminal structure in which an external positive electrode terminal 61, a positive electrode connection terminal 62, a positive electrode terminal plate (electrode terminal member) 63, an insulating plate 64, a gasket 65 and a positive electrode collector plate 121 are attached to a battery lid 103. It is configured.
- the external positive electrode terminal 61, the positive electrode connection terminal 62, the positive electrode terminal plate 63, and the positive electrode current collector plate 121 are formed of a conductive metal member such as an aluminum-based metal.
- the bus bar (second conductive metal member) 150 and the nut 57 are illustrated by a two-dot chain line.
- the external positive electrode terminal 61 has a bolt structure having a terminal portion 61a and a base portion 61b, and an external thread is formed on the outer periphery of the terminal portion 61a.
- the terminal portion 61 a of the external positive electrode terminal 61 is inserted through the opening 64 a of the insulating plate 64 and the opening 63 a of the positive electrode terminal plate 63.
- the base portion 61 b of the external positive electrode terminal 61 is inserted into the opening 64 a of the insulating plate 64, and is held between the positive electrode terminal plate 63 and the stepped portion 103 d of the battery cover 103.
- the gasket 65 is formed in the shape of a stepped ring having an opening 65a.
- the gasket 65 is inserted into the opening 103 c of the battery cover 103.
- the positive electrode connection terminal 62 is formed in a stepped cylindrical shape having a large-diameter lower cylindrical portion 62 a and a small-diameter upper cylindrical portion 62 b.
- the upper cylindrical portion 62 b of the positive electrode connection terminal 62 is inserted through the opening 65 a of the gasket 65 and the opening 63 b of the positive electrode terminal plate 63.
- the positive electrode terminal plate 63 is crimped by the upper cylindrical portion 62 b of the positive electrode connection terminal 62, and is fixed to the battery cover 103 together with the positive electrode terminal plate 63.
- the positive electrode connection terminal 62 of the positive electrode terminal structure integrated with the battery lid 103 is crimped and fixed to the positive electrode current collector 121, whereby the lid assembly is manufactured.
- the positive electrode terminal structure will be described in detail.
- the positive electrode terminal structure in this specification is a structure in which the positive electrode current collector 121 is removed from the lid assembly, and the positive electrode current collector plate 121 is connected to the positive electrode external terminal 61.
- Such a positive electrode terminal structure is manufactured as follows.
- the lower end of the positive electrode connection terminal 62 is inserted into the opening 121 c of the positive electrode current collector plate 121.
- the gasket 65 is attached to the lower cylindrical portion 62a of the positive electrode connection terminal 62 through the opening 65a, the battery cover 103 is attached to the gasket 65 through the opening 103c, and the insulating plate 64 is covered on the battery cover 103.
- the insulating plate 64 is fitted into the recess of the step portion 103 d of the battery cover 103, and the opening 64 b of the insulating plate 64 is fitted into the gasket 65.
- the base portion 61b of the positive electrode external terminal 61 is fitted into the recess of the insulating plate 64, and the positive electrode terminal plate 63 is fitted into the positive electrode external terminal 61 through the opening 63a.
- the positive electrode terminal plate 63 is attached to the upper cylindrical portion 62b of the positive electrode connection terminal 62 through the opening 63b.
- a negative electrode terminal structure is attached to the battery cover 103 on the negative electrode side.
- the negative electrode terminal structure basically has the same structure as the positive electrode terminal structure.
- the external negative electrode terminal, the negative electrode connection terminal, the negative electrode terminal plate (electrode terminal member) and the negative electrode current collector plate in the negative electrode terminal structure are made of copper-based metal.
- the external negative electrode terminal, the negative electrode connection terminal, the negative electrode terminal plate and the negative electrode current collector plate respectively correspond to the external positive electrode terminal 61, the positive electrode connection terminal 62, the positive electrode terminal plate 63 and the positive electrode current collector plate 121 in the positive electrode terminal structure. It is a member.
- the terminal structure on the negative electrode side is the same as the positive electrode terminal structure except for the above, and the assembling method is also the same, so the description will be omitted.
- Each bus bar 150 is formed of an aluminum-based metal or a copper-based metal in a rectangular flat plate shape.
- Each bus bar 10 has a pair of side surfaces parallel to the longitudinal direction and one end surface (front end surface) and the other end surface (rear end surface) perpendicular to the side surfaces provided on the battery cover 103 of the secondary battery cell 110 It is welded to the plating layer (metal layer) 4 of the plate 63.
- Aluminum-based metals include aluminum and aluminum alloys.
- Copper-based metals include copper and copper alloys.
- 11 is an enlarged cross-sectional view of the secondary battery module shown in FIG. 9 taken along line XI-XI.
- a nickel plating layer 4 is formed on the upper surface of the positive electrode terminal plate 63.
- the bus bar 150 is disposed on the plating layer 4. As described above, the bus bar 150 is inserted into the external positive electrode terminal 61 and the external negative electrode terminal 71, fastened by the nut 57, and fixed to the battery cover 103.
- 11 is the shape of the tip of bus bar 150 before welding bus bar 150 to plating layer 4 as in FIG. 5, 150d is the tip of bus bar 150 before welding, and 150e is the welding front. It is a tip corner portion of the bus bar 150.
- a welded portion 40 is formed on the tip end side of the bus bar 150, and the welded portion 40 is welded to the plating layer 4.
- the welded portion 40 has a melted portion 41 and an eluted portion 42 and is metal-joined to the plating layer 4 on the surface of the plating layer 4. That is, on the external positive electrode terminal 61 side, the aluminum-based metal is diffused to the surface of the plating layer 4 on the lower surface of the melting portion 41 and the elution portion 42 and metal bonding is performed on the surface of the plating layer 4.
- the copper-based metal is diffused to the surface of the plating layer 4 at the lower surface of the melting portion 41 and the elution portion 42, and metal bonding is performed on the surface of the plating layer 4.
- the depth of the metal bonding is only the surface layer of the plating layer 4 on either the external positive electrode terminal 61 side or the external negative electrode terminal 71 side and does not extend over the entire plating layer 4, and the surface of the positive electrode terminal plate 63 Has not reached.
- the plated layer 4 is annealed by laser irradiation when forming the welded portion 40.
- a welded portion 40 provided on the tip end side of the bus bar 150 is welded to the plating layer 4 formed on the surface of the negative electrode terminal plate.
- the welded portion 40 of the negative electrode terminal plate is welded to the plating layer 4 on the surface of the plated layer 4, and the welded structure of the positive electrode terminal plate 63 and the plated layer 4 except that the negative electrode terminal plate is formed of copper-based metal. Is the same as
- the fusion zone 41 and elution zone 42 are metal-joined in the surface layer of the plating layer 4 and therefore maintain the protection function of the battery lid 3 by the plating layer 4 such as corrosion resistance of the battery lid 3 after welding. be able to.
- the molten portion 41 and the elution portion 42 are metal-joined in the surface layer of the plating layer 4, so the distance in which the elution portion 42 flows on the plating layer 4 becomes large and the junction area increases. The power can be increased more.
- the adhesion between the battery cover 3 and the plating layer 4 is improved by annealing the plating layer 4 simultaneously with welding.
- an iron-based metal is illustrated as a material of the first conductive metal member.
- other metals such as copper or copper alloy can be used as the material of the first conductive metal member.
- an aluminum-based metal or a copper-based metal is exemplified.
- the material of the first conductive metal member is not limited to this, and other materials such as tin or tin alloy can be used, for example.
- nickel was illustrated as a material of the metal layer which forms the plating layer 4.
- other metals such as tin or tin alloy can be used as the material of the metal layer.
- the metal layer was illustrated as the plating layer 4 formed by plating.
- the metal layer may be, for example, a clad material in which a metal such as nickel or tin is diffusion bonded to an iron-based metal or a copper-based metal.
- the present invention can also be applied to bonding between other conductive metal members, and can be widely applied to a welded structure of conductive metal members that form a current path in a battery.
- the terminal structure of the secondary battery module on the positive side and the negative side is the external positive / negative terminal, positive / negative connection terminal, positive / negative terminal plate, positive / negative current collector plate, insulating plate 64 and gasket It illustrated as a structure comprised by 65.
- the terminal structure on the positive electrode side and the negative electrode side is not limited to this structure, as long as it has a structure in which the positive and negative electrode terminal members are attached to the battery lid 103 via the insulating member.
- the bus bar 150 is not limited to the structure fixed by the bolt structure, and may be fixed to the positive / negative electrode terminal member by fitting, arc welding or the like.
- the secondary battery cell and the secondary battery module for a hybrid electric vehicle are illustrated, but the present invention is not limited to this, and a portable small-sized consumer lithium ion secondary battery cell is disclosed. Can also be applied. Further, the present invention is applicable not only to lithium ion secondary battery cells but also to secondary batteries using a water-soluble electrolytic solution such as nickel hydrogen batteries, nickel cadmium batteries, and lead storage batteries.
- the present invention can be variously modified and applied within the scope of the invention, and in short, one metal member of the first and second conductive metal members formed of different materials.
- the metal layer may be provided, and the molten portion and the elution portion formed on at least a part of the tip of the other metal member may be welded to the metal layer on the surface of the metal layer.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
Description
例えば、円筒形二次電池は、有底筒状の電池缶に発電要素を収容すると共に電解液を注入し、電池蓋により電池缶の開口を封止することで密閉構造に形成される。発電要素は正・負極の電極を有しており、例えば、正極電極が電池蓋に電気的に接続される。正極電極と電池蓋との間には、かしめ等により電池蓋に一体化された安全弁装置が設けられている。電池蓋と安全弁装置とは、ガスケットを介して電池缶の一端側に設けられた開口部の周縁部にかしめられる。
電池蓋と安全弁装置の接合の強度を大きくすると共に電気抵抗を低減するため、安全弁装置の先端にレーザを照射して、安全弁装置を電池蓋に溶着する方法が知られている(例えば、特許文献1参照)。この先行文献には、レーザ照射により安全弁装置が溶融し、流動したアルミニウム系金属と鉄系金属とが融合し、強硬に接合されることが記載されている。
本発明の第2の態様による電池における溶接構造は、金属層は、第1の導電性金属部材に対する溶接による接合力が、第2の導電性金属部材よりも大きい材料により形成されていることが好ましい。
本発明の第3の態様による電池における溶接構造は、請求項1または2に記載の電池における溶接構造において、第1の導電性金属部材は鉄、銅、または鉄合金、銅合金のいずれかにより形成され、第2の導電性金属部材はアルミニウム、銅、錫、またはアルミニウム合金、銅合金、または錫合金のいずれかにより形成されることが好ましい。
本発明の第4の態様による電池における溶接構造は、請求項1乃至3のいずれか1項に記載の電池における溶接構造において、金属層は、第1の導電性金属部材に設けられためっき層であることが好ましい。
本発明の第5の態様による電池における溶接構造は、請求項1乃至4のいずれか1項に記載の電池における溶接構造において、電池は、正・負極の電極を有する発電ユニットと、一端側に開口が形成され、内部に発電ユニットおよび電解液が収容された電池缶と、発電ユニットの正・負極の電極の一方に接続された蓋ケースと、蓋ケースに一体化され、表面にめっき層が形成された電池蓋と、を備える二次電池セルであり、第1の導電性金属部材は電池蓋であり、金属層はめっき層であり、第2の導電性金属部材は蓋ケースとすることができる。
本発明の第6の態様による電池における溶接構造は、請求項5に記載の電池における溶接構造において、電池蓋および蓋ケースは、平面視で円形形状を有し、溶融部と溶出部は、蓋ケースの周囲に沿って断続して複数個所設けるようにすることができる。
本発明の第7の態様による電池における溶接構造は、請求項5または6に記載の電池における溶接構造において、蓋ケースに開裂弁を設けてもよい。
本発明の第8の態様による電池における溶接構造は、請求項6または7に記載の電池における溶接構造において、電池蓋は、周縁部と、周縁部から立ち上がる円筒部を有するハット型形状を有しており、蓋ケースは、電池蓋の周縁部の内面側に配置され、電池蓋の周縁部の内面側において、蓋ケースの先端をめっき層に溶着するようにしてもよい。
本発明の第9の態様による電池における溶接構造は、請求項6または7に記載の電池における溶接構造において、電池蓋は、周縁部と、周縁部から立ち上がる円筒部を有するハット型形状を有しており、蓋ケースは、電池蓋の周縁部の内面側に配置され、蓋ケースの周縁部が電池蓋の周縁部の内面側から外面側に折り返してかしめられ、電池蓋の周縁部の外面側において、蓋ケースの周縁部の先端をめっき層に溶着するようにしてもよい。
本発明の第10の態様による電池における溶接構造は、請求項8または9に記載の電池における溶接構造において、電池蓋は、円筒部の頭部に、円周方向に沿って設けられた複数の開口を有し、蓋ケースの溶融部および溶出部の円周方向における一端および他端は、開口に対応しない位置に設けられていることが好ましい。
本発明の第11の態様による電池における溶接構造は、請求項7乃至10のいずれか1項に記載の電池における溶接構造において、さらにガスケットを有し、電池蓋と蓋ケースは、ガスケットを介して電池缶の開口の周縁部にかしめるようにしてもよい。
本発明の第12の態様による二次電池セルは、請求項5乃至11のいずれか1項に記載の電池における溶接構造を備える。
本発明の第13の態様による電池における溶接構造は、請求項1乃至4のいずれか1項に記載の電池における溶接構造において、電池は、一端側に開口を有し、電池ユニットおよび電解液が収容された電池缶、電池缶の開口の周縁部に取り付けられた電池蓋および少なくとも外面にめっき層が形成され絶縁部材を介して電池蓋に設けられた電極端子部材を有する複数の二次電池セルと、隣接する二次電池セルの電極端子部材同士を接続するバスバーと、を備える二次電池モジュールであり、第1の導電性金属部材は電極端子部材であり、金属層はめっき層であり、第2の導電性金属部材はバスバーとすることができる。
本発明の第14の態様による電池における溶接構造は、請求項13に記載の電池における溶接構造において、バスバーは、前端面、後端面および一対の側面を有する矩形の板状に形成され、溶融部および溶出部は、バスバーの前端面、後端面および一対の側面に設けられていることが好ましい。
本発明の第15の態様による電池における溶接構造は、請求項13または14に記載の電池における溶接構造において、バスバーは締結部材により電極端子部材と共に電池蓋に取り付けられていることが好ましい。
本発明の第16の態様による二次電池モジュールは、請求項13乃15のいずれか1項に記載の電池における溶接構造を備える。
本発明の第17の態様による電池における溶接構造の形成方法は、第1の導電性金属部材上に設けられた金属層の一面上に、第1の導電性金属部材とは異なる材料により形成された第2の導電性部材の先端を配置する第1の工程と、第2の導電性金属部材の先端を溶融させ、溶融部および先端から金属層の一面上に流動する溶出部を形成し、溶融部と溶出部とを金属層の表面において金属層に溶着する第2の工程と、を備える。
本発明の第18の態様による電池における溶接構造の形成方法は、請求項17に記載の電池における溶接構造の形成方法において、金属層は第1の導電性金属部材に対する溶接による接合力が、第2の導電性金属部材よりも大きい材料により形成されていることが好ましい。
本発明の第19の態様による電池における溶接構造の形成方法は、請求項18に記載の電池における溶接構造の形成方法において、第1の工程は、第1の導電性金属部材にめっきにより金属層を形成する工程を含むことが好ましい。
本発明の第20の態様による電池における溶接構造の形成方法は、請求項18または19に記載の電池における溶接構造の形成方法において、第2の工程は、第2の導電性金属部材の先端にレーザを照射して溶融部と溶出部を設けるレーザ溶射工程を含み、レーザ照射工程においては、レーザのスポットの中心を第2の導電性金属部材の先端より内側の位置に照射するように行うことが好ましい。
本発明の第21の態様による電池における溶接構造の形成方法は、請求項20に記載の電池における溶接構造の形成方法において、レーザ照射工程は、レーザの照射により第2の導電性金属部材の先端に溶融部と溶出部を設けると共に金属層をアニールする工程であることが好ましい。
本発明の第22の態様による電池における溶接構造の形成方法は、請求項20または21に記載の電池における溶接構造の形成方法において、第2の導電性部材に照射するレーザの照射角度は、第2の導電性部材の先端面と平行な面よりも先端面よりも外側方向に傾斜しており、先端面と平行な面から20度以内であることが好ましい。
このため、電気抵抗が小さく、接合力が大きい、信頼性の高い溶接構造を得ることができる。
以下、図1~図5を参照して、本発明に係る電池における溶接構造の一実施の形態を説明する。
図1は、本発明に係る電池における溶接構造の一実施の形態としてのリチウムイオン二次電池セルの外観斜視図であり、図2は、図1に図示された二次電池セルの分解斜視図である。
図1に示す二次電池セル(電池)1は、ハイブリッド電気自動車用として好適な構造・性能を有し、例えば、外形40mmφ、高さ90mmのサイズの円筒形状を有し、定格容量は5Ahである。
二次電池セル1は、図2に示す円柱状の発電ユニット20が収容され、非水電解液(図示せず)が注入された電池缶2と電池蓋ユニット30とにより構成される電池容器を備えている。電池缶2は、上部(一端)側に開口を有する有底無頭の円筒形状に形成され、内・外の表面にニッケルのめっき層が施された厚さ0.5mmの炭素鋼で構成されている。電池蓋ユニット30は、電池蓋3と蓋ケース37とが一体化されて構成され、電池缶2の開口を塞いで、電池缶2にかしめられており、これにより外部から密封された電池容器が形成されている。
捲回群10は、例えば、ポリプロピレンにより成された中空円筒形状の軸芯15の外周に、長尺の正極電極及び負極電極を、セパレータを介して捲回し手構成されている。捲回群10の正極電極は、長手方向の一側縁沿って正極タブが等間隔に配列されたアルミニウム系金属箔の両面に正極合剤が塗工されて構成されている。負極電極は、長手方向の一側縁に沿って負極タブが等間隔に配列された銅系金属箔の両面に負極合剤が塗工されて構成されている。正極電極と負極電極とは、正極タブと負極タブとが、相対向する側に配置された状態で捲回される。
正極接続板35は、アルミニウム系金属により形成され、その外周がポリプロピレン製の絶縁リング38により保持されている。
負極導電リード23、負極集電部材21を介して捲回群10の負極電極に接続されている電池缶2は負極の出力端として用いられる。
電池缶2内に発電ユニット20が収容された後、電池缶2内に非水電解液が所定量注入される。
電池蓋ユニット30は、電池缶2内に発電ユニット20が収容され、非水電解液が所定量注入された状態で、ガスケット39を介して電池缶2の上部側の開口部の周縁部にかしめにより固定される。ガスケット39は、フッ素樹脂で形成されており、好ましい材料の例として、PFA(ポリテトラフルオロエチレン)、ETFE(エチレンテトラフルオロエチレン)を挙げることができる。
図3は、図2に図示された電池蓋ユニット30の拡大断面図であり、図4は、図3に図示された電池蓋ユニット30の上方からの平面図である。
蓋ケース37に導通している電池蓋3は、正極接続板35、正極導電リード33、正極集電部材31を介して捲回群10の正極電極に接続されており、二次電池セル1の他方の出力端として用いられる。上述した電池缶2の底面の負極出力端子と電池3の上面の正極出力端子とにより、捲回群10に蓄電された電力を取り出すことができる。
電池蓋3に形成された排気口3d1および3d2は、開裂弁37cが開裂した際に、二次電池セル1内部から放出されるミスト状のガスを排出するために形成されているものである。
図5(a)は、図3の領域Vの拡大図であり、図5(b)は、図5(a)における溶着部40を上面からみた図である。
電池蓋3にかしめられた蓋ケース37は、電池蓋3の外面側に折り返された周縁部37bの先端部における溶着部40においてめっき層4に溶着されている。めっき層4は、鉄系金属に対する溶接による接合力が、アルミニウム系金属よりも大きいニッケルにより形成されている。
図5(a)において、点線は蓋ケース37をめっき層4に溶着する前の蓋ケース37の周縁部37b先端の形状である。溶着部40は、溶着前の先端37dの周縁部に形成された溶融部41と、溶着前の先端37dから外方に流動した溶出部42とを含んでいる。溶融部41、溶出部42および溶着前の先端37dは、図5(b)に図示されるように円弧形状に形成されている。
溶融部41は、全体が溶着前の蓋ケース37の厚さよりも薄く、溶着前の先端37d側に向けて、漸次、薄くなるように傾斜する形状を有する。また、溶出部42は、溶着前の先端37dにおいて溶融部41になだらかに連続して形成され、溶着後の先端部に向けて、やはり、漸次、薄くなるように傾斜する形状を有している。
めっき層4は、後述する如く、溶着部40の周辺においてアニールされている。
溶融部41および溶出部42は、めっき層4の表面層において金属接合しているため、電池蓋3の耐食性等、めっき層4による電池蓋3の保護機能は維持される。また、溶出部42は、めっき層4上を流動する距離が大きくなり、接合面積が増大するため、接合力をより増大することができる。さらに、めっき層4がアニールされることにより、電池蓋3とめっき層4の密着度が向上する。
上記溶接構造を形成する方法について説明する。
図5に、二点鎖線で示されるように、溶着前の蓋ケース37の先端37dの角部37e近傍にレーザを照射する。レーザの照射位置は、例えば、先端37dよりも0.1mm程度内側とすることが望ましい。レーザの照射位置を、先端37dから0.1mmとし、先端37dよりの距離の公差を±0.1mmとすると、レーザスポットの中心が、蓋ケース37の角部37eの外側になることはない。
これに対し、めっき層4の表面層のみが溶融し、溶着部40がめっき層4の表面においてめっき層4に溶着されている場合には、電池蓋3に対するめっき層4による耐食性等の保護機能が維持される。このように、溶着部40がめっき層4の表面において溶着されている場合には、目視において、めっき層4における変色はほとんどみられない。
溶着状態を正確に評価するには、分析によることがより望ましいが、目視によるめっき層4の変色を観察することも評価の効率向上に有用である。
レーザ照射の傾斜角度θが、20度よりも大きくなると、電池蓋3からの反射によるエネルギーの損失が大きくなり、溶融部41を先端側に流動させ難くなる。レーザ照射の傾斜角度が0度からマイナスになると、レーザによりめっき層4に直接照射される領域と、周縁部37bの影になり、めっき層4に照射されない領域とが形成され、照射されるエネルギー密度のばらつきが大きくなるため、接合力が小さくなる。
レーザの傾斜レーザ溶着部40を、円弧状に連続して形成するには、電池蓋ユニット30を回転させながらレーザをスキャンする方法が効率がよい。
図6は、本発明による電池における溶接構造の実施形態2としての電池蓋ユニットの平面図である。
実施形態2の電池蓋ユニット30が、図4に図示された実施形態1と相違する点は、排気口3d2と溶着部40との位置関係である。
実施形態2における電池蓋ユニット30においても、溶着部40は、蓋ケース37の周縁部に沿って、円弧状に2箇所、蓋ケース37の中心に対して線対称に一対として形成されている。実施形態1においては、各溶着部40は、一端が1つの排気口3d2の位置に対応し、他端が隣接する排気口3d2の位置に対応して、隣接する一対の排気口3d2の全体を、その領域内に含むような位置関係に形成されている。
また、実施形態1および2において、溶着部40の長さおよび個数は、単なる一例であって、溶着部40の長さおよび個数は、適宜、設定することが可能である。例えば、溶着部40は、蓋ケース37の周縁部37bの全周縁に沿って設けてもよいし、あるいは、スポット状に複数個設けてもよい。
図7は、本発明による電池における溶接構造の実施形態3としての電池蓋ユニットの断面図であり、図8は、図7に図示された電池蓋ユニットを電池缶にかしめた状態の要部拡大断面図である。
実施形態5の電池蓋ユニット30が、図3に図示された実施形態1と相違する点は、蓋ケース37Aと電池蓋3とが、かしめられていない点である。
蓋ケース37Aは、平面視において、電池蓋3の直径よりも小さい直径に形成されており、周縁部37bの溶着部40は、その先端部が、電池蓋3の周縁部3aの電池缶2の内側に位置している。
溶着部40において一体化された電池蓋3と蓋ケース37は、ガスケット39を介在して電池缶2の上端部に設けられた開口部周縁にかしめられる。図8において、ガスケット39は、蓋ケース37の周縁部に設けられた溶着部40、電池蓋3の周縁部3aの内面、外周側面3a1、周縁部3aの外面を覆って、電池蓋3と蓋ケース37とにより圧縮されている。
他の構成は、実施形態1と同様であり、対応する構成に同一の符号を付してその説明を省略する。
図9乃至図11は、本発明に係る電池における溶接構造の実施形態4を示す。
図9は、二次電池モジュールの外観斜視図である。
二次電池モジュール(電池)100は、複数個の角形の二次電池セル110を組み付けて形成されており、例えば、ハイブリッド自動車用として好適な構造を有する。各二次電池セル110は、例えば、リチウムイオン二次電池であり、隣接する二次電池セル110に対して、外部正極端子61と外部負極端子71とが対向するように、交互に逆向きに配置されている。
なお、本明細書においては、電池は、二次電池セル1および二次電池モジュール100を含む広義における用語として用いられている。
二次電池セル110は、発電体である捲回群210と、捲回群210を収容する電池缶104と、電池缶104の開放端を封止する電池蓋103と、電池蓋103に設けられた正極端子構造と、正極端子構造と捲回群210の正極とを電気的に接続する正極集電板121とを備えている。また、二次電池セル110は、図10には示されていない、電池蓋103に設けられた負極端子構造と、負極端子構造と捲回群210の負極とを電気的に接続する負極集電体をも有している。
電池缶104に発電ユニット組立体を収容し、電池缶104の開放端部に電池蓋103をレーザ溶接して電池缶内部を密閉し、電池蓋103の注液口から電池缶内部に非水電解液を充填し、注液口を蓋で封止することにより、二次電池セル110が製作される。
正極側においては、電池蓋103に、外部正極端子61、正極接続端子62、正極端子板(電極端子部材)63、絶縁板64、ガスケット65および正極集電板121が取付けられた正極端子構造が構成されている。
外部正極端子61、正極接続端子62、正極端子板63および正極集電板121は、アルミニウム系金属等の導電性金属部材により形成されている。
なお、図10において、バスバー(第2の導電性金属部材)150およびナット57は二点鎖線により図示されている。
正極集電板121の開口121cに正極接続端子62の下端を挿入する。正極接続端子62の下部筒部62aに開口部65aを介してガスケット65を装着し、ガスケット65に開口部103cを介して電池蓋103を装着し、電池蓋103に絶縁板64を被せる。このとき、絶縁板64は電池蓋103の段部103dの凹部に嵌め込まれるとともに、絶縁板64の開口部64bがガスケット65に嵌め込まれる。
負極端子構造は、基本的には、正極端子構造と同一の構造を有する。但し、負極端子構造における外部負極端子、負極接続端子、負極端子板(電極端子部材)および負極集電板は、銅系金属により形成されている。上記において、外部負極端子、負極接続端子、負極端子板および負極集電板は、それぞれ、正極端子構造における外部正極端子61、正極接続端子62、正極端子板63および正極集電板121に対応する部材である。
負極側の端子構造については、上記を除いては正極端子構造と同様であり、また、組付け方法も同様であるので、その説明は省略する。
正極端子板63の上面には、ニッケルのめっき層4が形成されている。めっき層4上には、バスバー150が配置されている。上述した如く、バスバー150は、外部正極端子61および外部負極端子71に挿通され、ナット57により締結されて、電池蓋103に固定されている。
なお、図11における点線は、図5と同様、バスバー150をめっき層4に溶着する前のバスバー150の先端の形状であり、150dは、溶着前のバスバー150の先端、150eは、溶着前のバスバー150の先端角部である。
(1)実施形態に例示された電池蓋3または正極端子板63、負極端子板を構成する第1の導電性金属部材と、第1の導電性金属部材に設けられためっき層4により形成される金属層と、実施形態に例示された蓋ケース37またはバスバー150を構成する第2の導電性金属部材と、を備え、第2の導電性金属部材の先端側に、先端が溶融した溶融部41と、先端から金属層上に流動した溶出部42を形成し、溶融部41と溶出部42が金属層の表面において金属層に溶着されるようにした。
このため、電気抵抗が小さく、接合力が大きい、信頼性の高い溶接構造を得ることができる。
(4)溶着と同時にめっき層4がアニールされることにより、電池蓋3とめっき層4の密着度が向上する。
しかし、第1の導電性金属部材の材料として鉄系金属以外に、銅または銅合金等、他の金属を用いることができる。
第2の導電性金属部材の材料として、アルミニウム系金属または銅系金属を例示した。しかし、第1の導電性金属部材の材料は、これに限られるものではなく、例えば、錫または錫合金等他の材料を用いることができる。
しかし、金属層は、例えば、鉄系金属または銅系金属に、ニッケル、錫等の金属を拡散接合したクラッド材としてもよい。
また、リチウムイオン二次電池セルに限らず、ニッケル水素電池またはニッケル・カドミウム電池、鉛蓄電池のように水溶性電解液を用いる二次電池にも適用が可能である。
Claims (22)
- 第1の導電性金属部材と、
前記第1の導電性金属部材に設けられた金属層と、
前記第1の導電性金属部材とは異なる材料により形成された第2の導電性金属部材と、を備え、前記第1の導電性金属部材と第2の導電性金属部材とが前記金属層を介して接合され、充放電電流が流れる電池における溶接構造において
前記第2の導電性金属部材における先端部の少なくとも一部には、前記先端が溶融した溶融部と、前記先端から前記金属層上に流動した溶出部が形成され、前記溶融部と前記溶出部が前記金属層の表面において前記金属層に溶着されている電池における溶接構造。 - 請求項1に記載の電池における溶接構造において、前記金属層は、前記第1の導電性金属部材に対する溶接による接合力が、前記第2の導電性金属部材よりも大きい材料により形成されている電池における溶接構造。
- 請求項1または2に記載の電池における溶接構造において、前記第1の導電性金属部材は鉄、銅、または鉄合金、銅合金のいずれかにより形成され、前記第2の導電性金属部材はアルミニウム、銅、錫、またはアルミニウム合金、銅合金、または錫合金のいずれかにより形成されている電池における溶接構造。
- 請求項1乃至3のいずれか1項に記載の電池における溶接構造において、
前記金属層は、前記第1の導電性金属部材に設けられためっき層である電池における溶接構造。 - 請求項1乃至4のいずれか1項に記載の電池における溶接構造において、前記電池は、正・負極の電極を有する発電ユニットと、一端側に開口が形成され、内部に前記発電ユニットおよび電解液が収容された電池缶と、前記発電ユニットの前記正・負極の電極の一方に接続された内面にめっき層が形成された蓋ケースと、前記蓋ケースに一体化され、表面にめっき層が形成された電池蓋と、を備える二次電池セルであり、前記第1の導電性金属部材は前記電池蓋であり、前記金属層は前記めっき層であり、前記第2の導電性金属部材は前記蓋ケースである電池における溶接構造。
- 請求項5に記載の電池における溶接構造において、前記電池蓋および前記蓋ケースは、平面視で円形形状を有し、前記溶融部と前記溶出部は、前記蓋ケースの周囲に沿って断続して複数個所設けられている電池における溶接構造。
- 請求項5または6に記載の電池における溶接構造において、前記蓋ケースに開裂弁が設けられている電池における溶接構造。
- 請求項6または7に記載の電池における溶接構造において、前記電池蓋は、周縁部と、前記周縁部から立ち上がる円筒部を有するハット型形状を有しており、前記蓋ケースは、前記電池蓋の周縁部の内面側に配置され、前記電池蓋の周縁部の内面側において、前記蓋ケースの先端が前記めっき層に溶着されている電池における溶接構造。
- 請求項6または7に記載の電池における溶接構造において、前記電池蓋は、周縁部と、前記周縁部から立ち上がる円筒部とを有するハット型形状を有しており、前記蓋ケースは、前記電池蓋の周縁部の内面側に配置され、前記蓋ケースの周縁部が前記電池蓋の周縁部の内面側から外面側に折り返してかしめられ、前記電池蓋の周縁部の外面側において、前記蓋ケースの先端が前記めっき層に溶着されている電池における溶接構造。
- 請求項8または9に記載の電池における溶接構造において、前記電池蓋は、前記円筒部の頭部に、円周方向に沿って設けられた複数の開口を有し、前記蓋ケースの溶融部および溶出部の円周方向における一端および他端は、前記開口に対応しない位置に設けられている電池における溶接構造。
- 請求項7乃至10のいずれか1項に記載の電池における溶接構造において、さらにガスケットを有し、前記電池蓋と前記蓋ケースは、前記ガスケットを介して前記電池缶の前記開口の周縁部にかしめられている電池における溶接構造。
- 請求項5乃至11のいずれか1項に記載の電池における溶接構造を備える二次電池セル。
- 請求項1乃至4のいずれか1項に記載の電池における溶接構造において、前記電池は、一端側に開口を有し、電池ユニットおよび電解液が収容された電池缶、前記電池缶の前記開口の周縁部に取り付けられた電池蓋および少なくとも外面にめっき層が形成され絶縁部材を介して前記電池蓋に設けられた電極端子部材を有する複数の二次電池セルと、隣接する前記二次電池セルの前記電極端子部材同士を接続するバスバーと、を備える二次電池モジュールであり、前記第1の導電性金属部材は前記電極端子部材であり、前記金属層は前記めっき層であり、前記第2の導電性金属部材は前記バスバーである電池における溶接構造。
- 請求項13に記載の電池における溶接構造において、前記バスバーは、前端面、後端面および一対の側面を有する矩形の板状に形成され、前記溶融部および前記溶出部は、前記バスバーの前記前端面、前記後端面および前記一対の側面に設けられている電池における溶接構造。
- 請求項13または14に記載の電池における溶接構造において、前記バスバーは締結部材により前記電極端子部材と共に前記電池蓋に取り付けられている電池における溶接構造。
- 請求項13乃至15のいずれか1項に記載の電池における溶接構造を備える二次電池モジュール。
- 第1の導電性金属部材上に設けられた金属層の一面上に、第1の導電性金属部材とは異なる材料により形成された第2の導電性部材の先端を配置する第1の工程と、
前記第2の導電性金属部材の先端を溶融させ、溶融部および前記先端から前記金属層の前記一面上に流動する溶出部を形成し、前記溶融部と前記溶出部とを前記金属層の表面において前記金属層に溶着する第2の工程と、を備える電池における溶接構造の形成方法。 - 請求項17に記載の電池における溶接構造の形成方法において、前記金属層は、前記第1の導電性金属部材に対する溶接による接合力が、前記第2の導電性金属部材よりも大きい材料により形成されている電池における溶接構造の形成方法。
- 請求項18に記載の電池における溶接構造の形成方法において、前記第1の工程は、前記第1の導電性金属部材にめっきにより前記金属層を形成する工程を含む電池における溶接構造の形成方法。
- 請求項18または19に記載の電池における溶接構造の形成方法において、前記第2の工程は、前記第2の導電性金属部材の先端にレーザを照射して前記溶融部と前記溶出部を設けるレーザ照射工程を含み、前記レーザ照射工程においては、前記レーザのスポットの中心を前記第2の導電性金属部材の先端より内側の位置に照射する電池における溶接構造の形成方法。
- 請求項20に記載の電池における溶接構造の形成方法において、前記レーザ照射工程は、前記レーザの照射により前記第2の導電性金属部材の前記先端に前記溶融部と前記溶出部を設けると共に前記金属層をアニールする工程である電池における溶接構造の形成方法。
- 請求項20または21に記載の電池における溶接構造の形成方法において、前記第2の導電性部材に照射するレーザの照射角度は、前記第2の導電性部材の先端面と平行な面よりも前記先端面よりも外側方向に傾斜しており、前記先端面と平行な面から20度以内である電池における溶接構造の形成方法。
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